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设备腐蚀是化工企业经常接触的实际问题,人们往往把注意力集中于高温、强酸等严苛条件下的腐蚀,而忽视了在表面看来介质腐蚀性并不强的腐蚀。最近,上海某厂乙醛加压蒸馏塔使用仅一年左右,不锈钢塔体就发生了严重的局部腐蚀。目前虽然重新制作了一台不锈钢新塔投入运行,但进一步搞清不锈钢局部腐蚀原因,对延长设备使用寿命,是有所裨盖的。一、概况该厂酒精氧化制乙醛生产原采用常压蒸
Equipment corrosion is a real problem often encountered by chemical companies. People tend to focus on the corrosion under severe conditions such as high temperature and strong acid, while ignoring the corrosion which is not very corrosive on the surface. Recently, a plant acetaldehyde pressure distillation tower in Shanghai use only about a year, the stainless steel tower on the occurrence of serious localized corrosion. Although a new stainless steel tower has been reworked and put into operation at present, it is beneficial to further understand the reasons for local corrosion of stainless steel and to prolong the service life of the equipment. First, the general situation The factory alcohol oxidation of acetaldehyde production using the original steam